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authorGrant Grundler <grundler@gsyprf11.external.hp.com>2006-09-03 00:02:16 -0700
committerMatthew Wilcox <willy@parisc-linux.org>2006-10-04 06:48:07 -0600
commit56f335c89e28c488b1bfea3e5e697fce805c784d (patch)
tree3e1d01e70b85f57a49fb10e60703dafb15b626fc /arch/parisc/kernel
parent7908a0c72ee78ba5476c2a773d808c77593719c6 (diff)
[PARISC] Add new function to start local Interval Timer, start_cpu_itimer()
I couldn't find where the itimer was getting started for slave CPUs. CPU 0 (master) itimer was started in time_init() (arch/parisc/kernel/time.c). start_cpu_itimer() code was striped from time_init(). Slaves now start their itimer in smp_cpu_init(). This is a first step towards making gettimeoffset() work for SMP. Next step will be to determine the CR16 (cycle counter) offsets for each CPU relative to the master (CPU 0). Signed-off-by: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'arch/parisc/kernel')
-rw-r--r--arch/parisc/kernel/smp.c4
-rw-r--r--arch/parisc/kernel/time.c20
2 files changed, 14 insertions, 10 deletions
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 98e40959a56..f33e8de438d 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -430,8 +430,9 @@ smp_do_timer(struct pt_regs *regs)
static void __init
smp_cpu_init(int cpunum)
{
- extern int init_per_cpu(int); /* arch/parisc/kernel/setup.c */
+ extern int init_per_cpu(int); /* arch/parisc/kernel/processor.c */
extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */
+ extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */
/* Set modes and Enable floating point coprocessor */
(void) init_per_cpu(cpunum);
@@ -457,6 +458,7 @@ smp_cpu_init(int cpunum)
enter_lazy_tlb(&init_mm, current);
init_IRQ(); /* make sure no IRQ's are enabled or pending */
+ start_cpu_itimer();
}
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index ab641d67f55..47831c2cd09 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -223,22 +223,24 @@ unsigned long long sched_clock(void)
}
+void __init start_cpu_itimer(void)
+{
+ unsigned int cpu = smp_processor_id();
+ unsigned long next_tick = mfctl(16) + clocktick;
+
+ mtctl(next_tick, 16); /* kick off Interval Timer (CR16) */
+
+ cpu_data[cpu].it_value = next_tick;
+}
+
void __init time_init(void)
{
- unsigned long next_tick;
static struct pdc_tod tod_data;
clocktick = (100 * PAGE0->mem_10msec) / HZ;
halftick = clocktick / 2;
- /* Setup clock interrupt timing */
-
- next_tick = mfctl(16);
- next_tick += clocktick;
- cpu_data[smp_processor_id()].it_value = next_tick;
-
- /* kick off Itimer (CR16) */
- mtctl(next_tick, 16);
+ start_cpu_itimer(); /* get CPU 0 started */
if(pdc_tod_read(&tod_data) == 0) {
write_seqlock_irq(&xtime_lock);